Spark Plug; Brake - Arctic Cat 120 sno pro Operator's Manual

NOTE: Foam Filter Cleaner (p/n
0436-194) and Foam Filter Oil (p/n
0436-195) are available from Arctic
Cat.
4. Put the dry filter in a plastic bag;
then pour in recommended air fil-
ter oil and work the oil into the fil-
ter.
! CAUTION
A torn air filter can cause damage
to the engine. Contaminants may
get inside the engine if the filter is
torn. Carefully examine the filter for
tears before and after cleaning it.
Replace the filter with a new one if
it is torn.
5. Clean any debris from inside the
air cleaner. Be sure no debris
enters the carburetor.
6. Place the filter into the housing.
7. Place the air cleaner cover onto the
housing; then secure with the wing
nut.

SPARK PLUG

The recommended spark plug to use is
NGK BPR6ES. The correct spark plug
gap is 0.7 mm (0.028 in.). Varying ter-
rain conditions and operating usage
may require a spark plug of a different
heat range.
Checking Spark Plug
To see if the spark plug being used is of
the proper heat range for the conditions
in which it has been operated, pull the
spark plug cap off the spark plug,
remove the spark plug from the cylin-
der head, and examine the condition of
the center electrode insulator.
A. TAN or LIGHT BROWN insulator
indicates correct spark plug (heat
range).
B. LIGHT GRAY or WHITE insula-
tor indicates overheating of the
engine. This condition is caused
by a too lean condition or incorrect
spark plug (heat range too hot).
C. BLACK insulator indicates fuel in
the combustion chamber is not
burning completely. This condi-
tion is caused by a too rich condi-
tion or incorrect spark plug (heat
range too cold).
NOTE: If the center electrode
insulator is light gray, white, or
black and if the carburetor adjust-
ments and ignition timing are cor-
rect, a different spark plug may be
necessary. Authorized Arctic Cat
Snowmobile dealers have detailed
spark plug information. It may be
wise to consult your dealer before
changing the spark plug, as an
incorrect heat-range spark plug
could cause poor engine perfor-
mance or engine damage.

BRAKE

! WARNING
DO NOT operate the snowmobile
when any component in the brake
system is damaged, worn, or
adjusted improperly.
0725-048
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